Aeroplane brake



Jan. '20, 1931. c. N. HOYT ,653

AEROPLANE BRAKE- Filed Nov. 20. 1929 s Sheets-Sheet 1 Inveritor Jan. 20, 1931-. c. N. HOYT AEROPLANE BRAKE Filed Nov. 20. 1929.

3 Sheets-Sheet 2 I Inventor .fl'lamrzce v'ffoyt.

A tiomey By QM Jan. 20, 1931. C, N, HOYT 1,789,653

AEROPLANE BRAKE Filed Nov. 20, 1929 3 Sheets-Sheet 5 o I! I g I Inventor withan arm 31-31.

ure 6 that each of thetrip arms 31 i elongated narrow trip bar 4-9.

The trip bar 49 is adapted for reciprocaopposite end, said rock The triparms 31'31 have their "free end portions bent inwardly as at 32 to converge toward one-anotherat said free end as -shown to advantage in F igure 1. 1 Each of the trip arms 31 are of similar construction, and a detail description ofone is therefore believed to sufiice.

Thus it Will be seen from a study of Figouter free ends terminate in an arcuate jaw 33 vcooperating with an arcuate jaw 34 piv oted to'the arm as at 35 to engage a portion of a, loop 36 formed ongthc free end of a cable 37 wound upon the cable drum 8 as shown toadvantage in Figure 1. 7

I For retaining the portionso-f the loopbe tween the jaws, there is provided a suitable, spring 37anch'ored to the arm 31 and bearing against the pivotedjaw 34 as shown to advantage in Figure 6.

F or normally retaining the trip arm 31 in t a substantially forwardly and. upwardly inclined position as shownto advantage in Fig- I ures 2 and 6, the rock shaft 29'intermediate its ends has mounted thereon for" rotation" therewith a stop cam. wheel "38, with which engages one arm39 of a distorted V-shaped locking dog 40, which dog40 is pivoted intermediate its ends to the upper end of a bracket {1 rising from the floor of the compartment 6. p Theother arm42 of the dog 40 has pivo tally connected to the free ends thereof one end'o f a trip cable 43, which trip cable extends forwardly and througha guide openf ing 44' which provides a communicating pas sage betweenlthecompartment 6 and a narrow elongated trench or recess 45 located forwardly of the compartment 6 and spaced therefrom; I j s i This. trench or recess 45extends trans l versely of the pit P and is of a length slightly greaterthairthe width of said Arpit.

ran ed within the trench 45 at the opposite ends thereof are vertical guide brackets 46 provided a t-their upper ends withelongated vertical slots 47 for receiving the guide pins 48 projecting from theadj acent ends of an tory movement in o and out of said trench45,

o and is normally maintained outwardly of the trench and above the surface ofthe earth through the medium of vertical coil springs 50- 50, which coil springs SU -50 are located in opposite ends'of the trench, the bottom or lower end of which coil spring depends again-st the bottom of the trench and the upper end of which coil springs are anchored to-the adjacent end of the trip bar as at 51.

Arranged within the trench 45 intermediate the ends thereof is a vertically disposed bracket 52 to the upper shaft, 29 is provided 1 at their I. ends of which is pivotally mounted as at53, a bell crank lever,

one arm 54 of said bell crank lever being secured to that end of the trip cable 43 which extends through the passage 44.,

The other arm 55 of said bell crank lever is pivotally connected to one end of a link 56, v i the other end of which link 56 is pivotally connected as at 57 to a suitablebracket 5 depending from an intermediate portion of the trip bar 19 as shown to advantage in Figure3.

Disposed over the-pit Pis a relatively large cover plate 58, which cover plate 58'forwarch "ly'of the drum 8 is provided with an opening 59 within which is rotatably mounted a pulley roller .60, and as shown to advantage in FigurefQ', the cable 37 extends through the opening 59 and is trained over the cable 60 and as before intimated the free end of the cable terminates in the loop 36 to be engaged with the jaws of the trip arm 3131 as herein- 7 before described in detail. v r

i As shownto advantage in Figure 2, that portion of the cover plate 58 disposed over the compartment 7 islprovided with a'relamg 60 the arms'31 are adapted to work.

When ;the dog 39 is moved out of-engage-- ment with'the stopcam 38 in a manner to be hereinafterfset forth, the arms 31 31 are adapted to be actuated to swingupwardly through the opening 60in the'cover plate 58 tofassume a vertical position as shown in dotted, lines in, Figure 6 and to accomplish .this swinging movement of the arm, there is provided a coil spring 61 convoluted about one end of the rock 'shaft29, one end of which coil spring 61" is: anchored to the bottom of the compartment .6 as at 62',an'd the other, end ofsaid coil spring 61 is bent laterally as at 63 to engage the arm 31 as at 63.

Manifestly, the spring 61 will urge the arm 31 upwardly to the vertical position before i mentioned thus placing the loop 36 above the top surface of the cover plate 58, so that when an aeroplanerunning over the earth and over the pit P, the usual hook on the rear end of the aeroplane will engage with the loop 36,

and at the same time a-br'ea king action will be applied to-the drum 8 in a manner to be hereinafter set forth and thus the aeroplane is brought to a smooth and even'stop.

The operation of the device may be explic itly statedasfollows Normally, the parts are in that positionshown to advantage in Figure 2, so that the aeroplane passing over the ground will first rise over the trip bar 49 thus depressing the bar rocking the bell crank for actuating the vtrip cable 43 whereupon the locking dog40 will be moved out of engagement with the cam 38 and under the action of the spring 61 the shaft 29 will be rocked or rotated so as to swing the arm 31upwardly through the opening 60 to a substantially vertical position thus suitably positioning the loop 36 whereby the latter may be hookec on the rear of the aeroplane as before intimated.

tively large opening 60through whichopenth'mediu'm p' f 'the gearmg This believed 01 3f forhj tliga f gggi V 16 liable r 1011] hrebysaid 1 for placing said loop in a position to be eneng'ageable with said loop, for" retaining s aid V loop in a spread position,a recessextending transversely of the pit; inspaced relation to the forward end of said pit,ra spring pressed trip baradaptedformovement into and out of said pit, and disposednormallyabove the surface'of theearth, spring means forrotats ing saidrock shaft in one direction for mov- 1n said arm will extend above thetop of the pit gaged byjavehicle passing oversaid .pit, and an operating connection between said shaft and said trip; bar fornormally retaining said arm inwardly of thepit, said drum being provided at one end with a straight drum, a brake; band; about saidbrake drum, fluid presi "sure controlledmeans for drawingthe brake saidroekshaft, said armsengagingwith said.

band, f in frictional engagement about, said brake drum for retaining said cable drumc against rotation when said loop is engaged by a vehicle, said last mentioned means ineludingv a valve m'echanism, and means for controlling said valve from said rock 1 shaft. 6. In a braking device of theclass de:

scribed, a rotatably mountedcable drum; arranged within a pit overwhich a vehicle may pass, a-cable wound' on said cabledrum, saidpcable at one end terminating in aloop, a rock shaft mounted within ,theiforward end of said pit, a pair of said arms carried by loop, spring means for rotating said: rock shaft; in i one" direction, whereby said arms,

maybe moved to a vertical position to extend through the top of said pit wherebysaid loop may be placedin positionto be engaged by a vehicle, the trip bar mounted exteriorly,

of said'pit at the forward 'endof the pit, means controllable by said trip barnormally retaining said arms interiorly of the pit, air

compressor means arranged within said pit,

abrake-mechanism for said drum, said brake mechanism comprising a fluid operated pis- \on,.an airlconduit leading from saidair' compressing mechanism to the cylinder of said piston, avalve arranged within said con duit, and an operating connection between said valve and said rock shaft whereby when said rock shaft is rocked inone directionfor I raising the'armtoa vertical ,pos1t1on, sa1d valve :will be moved to an open vposit-ion whereb'y fluid will be admitted to said cylinder for actuating the piston therein to apply said braking mechanism to said cable drum.

7. In a braking device, of the class described, arotatably mounted cable drum arranged withina pit over which a vehicle may pass, acable'wound on said cable drum, said cable at one end terminating in a loop,

arock shaft mounted within the forward end of said pit, a pair. of said arms carried by saidirock shaft, said arms engaging with said loop, spring means for rotating said rock shaft in ne direction, whereby said arms 1 Vehicle, the tri" said arm to a verticalpositiontwhereby V r 1,789,653 a ton, an air conduit leading from said air compressing mechanism to, the cylinder of said piston, a valve arranged within said con duit, and an operating connection between said valve and said rock shaft whereby when said rock shaft is'rocked in one direc tion for'raising the arm to a vertical position, saidvalve. will be moved to an open position whereby fluid will be admitted to said cylinder for actuating the pistontherein to drum, an electric motor within said pit, and an operating connection between said motor and said drum for rewinding the cable upon saiddrumj c 8. In a brake mechanism of the class idescribed, arock shaft mounted within a pit over which avvehicle may move, means for mounting said rock shaft in said :pit, a pair of arms carried by said rock shaft and adapt ed tob'emoved to: a vertical position to ex- .tend outwardly of said pit above the level of I the, ground, a flexible member engaged by said arms and'having a portion lthereof ex- I tending between said arms, andmeans controllableby a vehicle for actuating said shaft whereby said arms will be moved to a verti-. v I

cal position for her in the ath'o said vehicle.

9. In a rake mechanism of the class described, a rock shaft mounted within a pit placing said flexible memv over which a vehicle may move,means for V mounting said rock shaft in said pit, a pair of arms carried by saidrock shaft and adapted to be moved to a vertical position to extend outwardly of said pit above the level of the ground, a flexible member engaged by said armand-having a portion thereof extending 7 between saidarm, and means controllable by a vehicle for actuating .said shaft whereby said arms will be moved toa verticalposition for placing said flexiblemember in the path of said vehicle,rsaid last mentioned means including a vehicle actuated trip bar, spring means for normally rotating said shaftin one direction, means engageable with said shaft for retaining said shaft against rotary iriovement, and an operating connection between said last mentioned means, and said vehicle vactuated trip bar for releasing said shaft whereby said shaftmay'be rotated under the action of said spring for moving said arm to a position exteriorly of said pit. V In testimony whereof I afiix my signature.

CLARENCE 'N. HO YTQ 85 apply said braking mechanism to said cable 7 

